129 lines
4.2 KiB
Groff
129 lines
4.2 KiB
Groff
.\" $OpenBSD: nfssvc.2,v 1.25 2022/07/30 07:19:30 jsg Exp $
|
|
.\" $NetBSD: nfssvc.2,v 1.6 1995/02/27 12:35:08 cgd Exp $
|
|
.\"
|
|
.\" Copyright (c) 1989, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)nfssvc.2 8.1 (Berkeley) 6/9/93
|
|
.\"
|
|
.Dd $Mdocdate: July 30 2022 $
|
|
.Dt NFSSVC 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm nfssvc
|
|
.Nd NFS services
|
|
.Sh SYNOPSIS
|
|
.In unistd.h
|
|
.In nfs/nfs.h
|
|
.Ft int
|
|
.Fn nfssvc "int flags" "void *argstructp"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn nfssvc
|
|
function is used by NFS daemons to pass information into the kernel
|
|
and also to enter the kernel as a server daemon.
|
|
The
|
|
.Fa flags
|
|
argument consists of several bits that show what action is to be taken
|
|
once in the kernel and the
|
|
.Fa argstructp
|
|
points to one of two structures depending on which bits are set in
|
|
flags.
|
|
.Pp
|
|
To enter an
|
|
.Xr nfsd 8
|
|
daemon into the kernel,
|
|
.Fn nfssvc
|
|
is called with the flag
|
|
.Dv NFSSVC_NFSD
|
|
and a pointer to a structure:
|
|
.Bd -literal
|
|
struct nfsd_srvargs {
|
|
struct nfsd *nsd_nfsd; /* Pointer to in kernel nfsd struct */
|
|
uid_t nsd_uid; /* Effective uid mapped to cred */
|
|
u_int32_t nsd_haddr; /* IP address of client */
|
|
struct xucred nsd_cr; /* Cred. uid maps to */
|
|
int nsd_authlen; /* Length of auth string (ret) */
|
|
u_char *nsd_authstr; /* Auth string (ret) */
|
|
int nsd_verflen; /* and the verifier */
|
|
u_char *nsd_verfstr;
|
|
struct timeval nsd_timestamp; /* timestamp from verifier */
|
|
u_int32_t nsd_ttl; /* credential ttl (sec) */
|
|
};
|
|
.Ed
|
|
.Pp
|
|
To add further sockets for processing by the
|
|
.Xr nfsd 8
|
|
server daemons the master
|
|
.Xr nfsd 8
|
|
daemon calls
|
|
.Fn nfssvc
|
|
with the flag
|
|
.Dv NFSSVC_ADDSOCK
|
|
and a pointer to a structure:
|
|
.Bd -literal
|
|
struct nfsd_args {
|
|
int sock; /* Socket to serve */
|
|
caddr_t name; /* Client address for connection based sockets */
|
|
int namelen; /* Length of name */
|
|
};
|
|
.Ed
|
|
.Sh RETURN VALUES
|
|
Normally
|
|
.Fn nfssvc
|
|
does not return unless the server
|
|
is terminated by a signal when a value of 0 is returned.
|
|
Otherwise, \-1 is returned and the global variable
|
|
.Va errno
|
|
is set to specify the error.
|
|
.Sh ERRORS
|
|
.Bl -tag -width Er
|
|
.It Bq Er EPERM
|
|
The caller is not the superuser.
|
|
.It Bq Er EINVAL
|
|
The flag argument consisted of incompatible or otherwise
|
|
unsupported bits.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr mount_nfs 8 ,
|
|
.Xr nfsd 8 ,
|
|
.Xr sysctl 8
|
|
.Sh HISTORY
|
|
The
|
|
.Fn nfssvc
|
|
function first appeared in
|
|
.Bx 4.3 Reno .
|
|
.Sh BUGS
|
|
The
|
|
.Fn nfssvc
|
|
system call is designed specifically for the NFS
|
|
support daemons and as such is specific to their requirements.
|
|
Several fields of the argument structures are assumed to be valid and
|
|
sometimes to be unchanged from a previous call, such that
|
|
.Fn nfssvc
|
|
must be used with extreme care.
|